Part of speech: Noun
a person who holds religious beliefs in conflict with the dogma of the Roman Catholic Church
Categories: Outcast, Castaway, Pariah, Ishmael
Part of speech: Noun
a person who holds unorthodox opinions in any field (not merely religion)
Categories: Nonconformist, Recusant
Religious outcast, Heretic, Misbeliever
The word "heretic" comes from Ancient Greek αἱρέω. It started in Ancient Greek αἱρετικός. Then it appeared in Ecclesiastical Latin haereticus. Later, people used it in Old French eretique. After that, it was Middle English heretyk.
Each language in this chain added phonetic changes that transformed the original sound.